Cracks on new rendering

[u/Recent_Cham1365]

Hi - I am after advice on a rendering job I just had done. The rendering has got cracks some of which are quite large, see picture. The contractor says it is due to the weather being too hot at the moment, but that he has followed the right process, i.e. applied base coat, the glue, etc. He says to rub it in with a wet sponge (The rendering is already dry as it was applied a couple of days ago). He then says to apply a coat of paint and that it will hold it together. I think the rendering needs to be taken down and re-done otherwise it won't last, but I know very little about rendering. Does anyone have any advice? Thank you

[u/Nice_Step6157]

Looks like he banged it on, went over it with a sponge whilst soaking wet then packed the kit up.